Question

Решит уравнения пожалуйста Срочно ！ч

Answer 1

6) 2,5 x : 7 = 1/28 :30

2.5 x / 7 = 1 / (28*30)

2.5 x * 28*30 = 7*1   2.5x = 7/ (28*30)  2.5x = 7/840 x = (7/840) :2.5
x = (1 / 120) * (1/2.5)   x = 1 / 300

7) 2/5 = 8 / (x+2)   2*(x+2) = 5*8  x+2 = 40/2   x+2 = 20   x=20+2   x=18


8) 2/(x-0.5) = 1/0.3   2*0.3 = 1*(x-0.5)  x-0.5 = 0.6   x = 0.6+0.5  x = 1.1